KR100848743B1 - Crankshaft deflection measurement device - Google Patents

Abstract

A device of measuring the deflection of a crank shaft is provided to improve the receiving sensitivity of measured data and reduce the weight. A device of measuring the deflection of a crank shaft includes a case, a measuring module, a measuring unit controller, and a measuring unit wireless communication module. The case is made of plastic. An upper case(120a) and a lower case(120b) are coupled with each other. A coupling rib(126) is formed on a frame of the upper case. A coupling slot(127) is formed on a frame of the lower case. The coupling rib is inserted into the coupling slot, so that the upper and lower cases are coupled to each other. The connection of the upper and lower cases maintains external air tightness.

Description

Crankshaft deflection meter {CRANKSHAFT DEFLECTION MEASUREMENT DEVICE}

1a and 1b is a perspective view schematically showing a conventional crankshaft deflection measuring instrument,

2 is a view schematically showing a state in which a crankshaft deflection measurement system according to an embodiment of the present invention is used,

3 is a block diagram schematically showing the crankshaft deflection measurement system shown in FIG.

4 is an exploded perspective view of the crankshaft deflection measuring instrument shown in FIG.

5 is a perspective view showing a cut part of the measurement module of the crankshaft deflection measuring instrument shown in FIG.

6a and 6b are perspective views for explaining the operation of the crankshaft deflection measuring instrument shown in FIG.

7 is an exploded perspective view schematically showing a case of the crankshaft deflection measuring instrument shown in FIG. 2;

8 is a longitudinal cross-sectional view of the crankshaft deflection meter shown in FIG. 2.

<Description of main reference numerals in the drawings>

10; Crankshaft 11; Crank throw

100; Meter 120; case

120a; Upper case 120b; Lower case

124; Dividing wall 125; Partition slot

126; Bonding ribs 127; Mating slot

140; Measurement module 141; Support

141a; Horizontal portion 141b; 1st vertical section

141c; Second vertical portion 141d; Guide home

143; Measuring bar 144; Elastic member

145; Guide bar 146; stopper

146a; Coupling portion 146b; Support

147; Guide protrusion, screw 150; Displacement sensor unit

200; Terminal 240; Terminal control unit

280; Display

The present invention relates to a crankshaft deflection meter for measuring deflection of the crankshaft.

Typically, marine diesel engine is composed of a cylinder (Cylinder), a piston (Piston), a crank shaft (Crank Shaft) and the like. In particular, the crankshaft is assembled to the bed plate together with the main bearing shell to connect the up and down movement of the piston with the connecting rod to convert it into a rotational movement. It is the most expensive product among engine parts that accounts for more than 10%.

These crankshafts are largely divided into crank throw and journal parts, and the ingot material of the crank throw and journal is formed by using a press, and processed in a dedicated processing equipment, and then shrink fitting ) It is made into an integral shape by the construction method.

On the stern side of the crankshaft, a chain wheel and turning wheel are assembled to transfer the rotational movement of the crankshaft to the camshaft, and to slowly rotate the crankshaft during engine maintenance work. Play a role. There is also a thrust collar that creates thrust bearings along with thrust bearings.

On the other hand, on the bow side of the crankshaft, a flange is formed so that a tuning wheel, an axial vibration damper, and the like are assembled. As the crankshaft deflection occurs during the rotational movement of the crankshaft, the deflection value is measured and the assembly state of the engine is corrected when the deflection value is exceeded.

Conventional measurement techniques include the use of a manual dial gauge. In this case, the operator enters the bed plate during the rotation of the crankshaft and visually checks the deflection value at the measurement position to deliver the measurement orally to an external recorder. However, in the conventional technology as described above, the operator has to check the measurement value inside the bedplate while the deflection is measured by a lantern, and deliver it to the external recorder for nurturing.

For this reason, recently, researches are being conducted to develop a technology for mounting a measuring device as shown in FIGS. 1A and 1B to a crank throw of a crankshaft, and receiving and displaying data measured by the measuring device through wireless communication. .

1A and 1B, the measuring device includes a metal case 1, and an upper surface of the case 1 is formed by recessing a first accommodating groove 1a, and a lower surface of the second accommodating groove. (1b) is recessed and formed. A sensor module is mounted in the first accommodating groove 1a and a battery is mounted in the second accommodating groove 1b. More specifically, the guide rail (2) is formed on the bottom surface of the first receiving groove (1a), the guide groove (3a) is formed on the upper surface of the guide rail (2) is inserted The guide member 3 is mounted. In addition, a support plate 4 is installed on an upper surface of the guide member 3, and an encoder strip 5 is fixedly installed on one side of an upper surface of the support plate 4. In addition, the upper surface of the support plate 4 has a measuring bar fixing protrusion 5a for fixing one end of the measuring bar 7 and one end of the tension spring 8 for pressing the measuring bar 7 to one side. The spring fixing protrusion 5b to be fixed is formed to protrude upward. A ball bearing for guiding the reciprocating linear movement of the measuring bar 7 is installed in the front wall 1c of the first accommodating groove 1a of the case 1.

The measuring device having the structure as described above has a limit in reducing the thickness, and also has a limit in reducing the longitudinal width of the measuring bar 7. Therefore, although the deformation amount of the crank throw of the low speed large engine can be measured, there is a disadvantage in that the deformation amount of the crank throw of the small and medium engine cannot be measured due to the size of the measuring device.

In addition, the measuring device having the above-described structure is a high number of parts are applied to the product cost is high and the assembly process is complicated.

In addition, the interval variation of the crank throw measured from the measuring device, that is, the data about the crankshaft deflection, is transmitted to the terminal and output to the storage and display unit in the order of measurement. Therefore, the information on which crank throw the measured value was measured and at what point the crankshaft was measured should be written by hand. Therefore, the measuring device has a disadvantage that not only data is difficult to identify but also easy to manage.

On the other hand, the measuring device has to transmit the data measured by wireless communication with the terminal for outputting the measurement data, there is a problem that the wireless communication module is located inside the case 1 of the metal material, the reception sensitivity of the radio wave is reduced. In addition, since the case 1 is formed of a metal material, the weight of the measuring instrument increases, and as the weight increases or decreases, the case 1 is likely to fall from the crank throw.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described point, and an object thereof is to provide a crank throw deflection measuring device capable of improving reception sensitivity of a measurement data and reducing weight.

Another object of the present invention is to provide a crankshaft deflection measuring device capable of reducing the number of parts as well as miniaturization.

Another object of the present invention is to provide a crankshaft deflection system that can efficiently and easily measure and manage the amount of fluctuation in the gap of the measured crank throw.

The crankshaft deflection measuring device according to the present invention for achieving the above object is formed of a plastic material case having a first accommodating portion and the second accommodating portion is formed to be partitioned from the first accommodating portion; A measurement module mounted to the first accommodating part and configured to measure an interval variation of the crank throw and output an electrical signal; And a measuring instrument wireless communication module provided inside the case to be electrically connected to the measuring module and transmitting measured data in a wireless communication method.

According to an embodiment of the present invention, the case includes an upper case and a lower case coupled to the upper case, and the upper case and the lower case are coupled ribs to prevent the inflow of foreign matter therein; The engagement ribs are engaged by engagement slots into which the engagement ribs are inserted. More specifically, the coupling rib is formed on the edge of the upper case, the coupling slot is formed on the edge of the lower case.

In addition, a partition wall and a partition wall slot into which the partition wall is inserted are formed between the first accommodation part and the second accommodation part. More specifically, the partition wall is formed in the upper case, the partition wall slot is formed in the lower case.

The measuring module includes a support having a horizontal portion and a first vertical portion and a second vertical portion spaced apart from the horizontal portion, the second vertical portion having a contact portion in contact with one surface of the crank throw; A measuring bar protruded from the first vertical portion so that the first vertical portion and the second vertical portion are reciprocally supported in the front-rear direction and protrude from the first vertical portion so that one end thereof contacts the other surface facing one surface of the crank throw; A displacement sensor unit for detecting an amount of forward and backward movement of the measurement bar; An elastic member for urging the measurement bar forward; And a stopper for restricting the measurement bar from moving forward.

The stopper includes a coupling portion fixed to the measurement bar; And a support part protruding from one side of the coupling part to support one end of the elastic member, and the other end of the elastic member is supported by the second vertical part.

Guide grooves are formed in the horizontal portion in the front and rear directions, and the measuring bar is provided with guide protrusions inserted into the guide grooves to guide the movement of the measuring bars in the front and rear directions.

Here, the guide protrusion may be composed of a screw for coupling the coupling portion to the measuring bar.

The displacement sensor unit may include a linear encoder strip fixed to the measurement bar and moved forward and backward with the measurement bar; And an encoder head configured to output, as an electrical signal, an amount of change in the distance between one surface and the other surface of the crank throw from the forward and backward movement of the linear encoder strip.

On the other hand, the object as described above is installed on the inner surface of the crank throw of the crankshaft measuring instrument for measuring the amount of variation in the crank throw; And a terminal for wirelessly receiving and displaying the interval variation of the crank throw measured from the measuring device, wherein the measuring device is formed to be partitioned from the first accommodating part and the first accommodating part and accommodates a battery. A plastic case provided; A measurement module mounted to the first accommodating part and configured to measure an interval variation of the crank throw and output an electrical signal; And a crankshaft deflection measurement system provided inside the case to be electrically connected to the measurement module and including a measuring device wireless communication module for transmitting measured data in a wireless communication method.

According to an embodiment of the present invention, the terminal comprises: a terminal wireless communication module for receiving an amount of change in the interval of the crank throw measured from the measuring device wireless communication module; A display unit for displaying a variation amount of the crank throw; And outputting a cylinder number to the display unit so as to select a cylinder corresponding to the crank throw of the measurement target, and when the cylinder number of the measurement target is selected, an amount of change in the interval of the crank throw transmitted from the terminal wireless communication module to correspond to the selected cylinder. It includes a control unit for storing in the memory.

Hereinafter, a crankshaft deflection measurement system according to an embodiment of the present invention will be described in detail.

As shown in FIG. 2, the crankshaft deflection measurement system includes a measuring device 100 for measuring the amount of variation in the crank throw 11 interval of the engine crankshaft 10, that is, the deflection of the crankshaft 10. It includes a terminal 200 for displaying the interval variation of the crank throw 11 measured from the measuring device 100.

The measuring device 100 is installed between both sides of the crank throw 11 facing each other to measure the amount of change in the gap of the crank throw 11, the amount of change in the gap measured from the measuring device 100 to the terminal 200 It is transmitted in a wireless communication method.

3 to 8, the meter 100 includes a case 120, a measurement module 140, a meter control unit 160, and a meter wireless communication module 180.

The case 120 is formed of a plastic material and includes an upper case 120a and a lower case 120b which are coupled to each other.

A coupling rib 126 is formed at an edge of the upper case 120a, and a coupling slot 127 into which the coupling rib 126 is inserted is formed at an edge of the lower case 120b. As such, the coupling rib 126 of the upper case 120a is inserted into the coupling slot 127 of the lower case 120b so that the upper case 120a and the lower case 120b are coupled to each other. In this structure, the upper case 120a and the lower case 120b can maintain the airtightness with the outside, thereby preventing foreign substances such as engine oil from entering the measurement module 140. The durability and reliability of the measuring device 100 can be secured.

One side of the combined case 120 is formed with a first accommodating part 121 for mounting the measurement module 140, and a second accommodating part 122 for accommodating the battery 123 is formed at the other side. To be prepared. A partition wall slot 125 into which the partition wall 124 and the partition wall 124 are inserted is formed between the first accommodation part 121 and the second accommodation part 122. More specifically, the partition wall 124 is formed in the upper case 120a, and the partition wall slot 125 into which the partition wall 124 is inserted is formed in the lower case 120b. With such a structure, it is possible to prevent foreign substances such as engine oil, which may be introduced through the second accommodation portion 122, from entering the first accommodation portion 121. That is, the foreign matter is primarily prevented from entering by the coupling rib 126 and the coupling slot 127 formed at the edge of the case 120, and the separation wall 124 and the separation wall slot 125 By preventing secondary foreign matters from flowing through the second accommodating part 122, the measurement module 140 seated on the first accommodating part 121 may be more firmly protected from external foreign matters.

In addition, by manufacturing the case 120 from a plastic material such as injection molding, it is possible to reduce the weight of the measuring device (100). By reducing the weight of the measuring device 100, the measuring device 100 can be prevented from falling from the crank throw 11.

In addition, by forming the case 120 made of a plastic material, the intensity of the radio wave transmitted from the measuring instrument wireless communication module 180 and passed through the case 120 is a conventional metal case (see FIG. 1A). It is greater than the intensity of radio waves passing through it. Therefore, not only the reception sensitivity of the radio wave received by the terminal 200 is improved but also the distance that the terminal 200 can receive increases.

The measurement module 140 includes a support 141, a measurement bar 143, an elastic member 144, a stopper 146, and a displacement sensor unit 150.

The support 141 is seated on the first accommodating part 121 and fixed to the case 120 by a screw or the like. The support 141 includes a horizontal portion 141a and a first vertical portion 141b and a second vertical portion 141c formed to protrude upwards at front and rear ends of the horizontal portion 141a.

A guide groove 141d is formed in the front and rear directions in the horizontal portion 141a to guide the front and rear movement of the measurement bar 143. A sliding bearing may be inserted into the first vertical portion 141b so that the measuring bar 143 may be inserted to smoothly move the sliding bar. In addition, the second vertical portion 141c is provided with a coupling member 142 having a hollow inside so that the rear end of the measuring bar 143 may be inserted therein.

When the coupling member 142 has a large gap between the crank throw 11, a thread is formed on the outer circumference thereof so as to connect an extension bar, and the crank throw 11 is formed at the end of the coupling member 142. The contact portion 142a in contact with one surface of is formed to protrude.

The measurement bar 143 is installed on the first vertical portion 141b and the second vertical portion 141c so as to be reciprocated in the front-rear direction. That is, the measurement bar 143 is guided in the front and rear direction by the first vertical portion 141b and the second vertical portion 141c. In this way, the measurement bar 143 is installed so that the front and rear movement is guided by the first vertical portion 141b and the second vertical portion 141c, and thus the guide member and the support having the existing guide rail and the guide groove are formed. The plate can be omitted. By omitting the components in this way, not only the number of parts can be reduced but also the assembly process can be simplified and the size of the measuring device 100 can be reduced.

A sharp part 143a is formed at the front end of the measuring bar 143 in contact with the inner surface of the crank throw 11, and the front end of the measuring bar 143 is external to the support 141 and the case 120. Exposed.

The elastic member 144 is for pressing the measuring bar 143 to the front, and overcomes the elastic force of the elastic member 144 by the elastic member 144 by the variation of the crank throw 11 interval back The moved measurement bar 143 can be returned to its original state. The elastic member 144 is inserted into the guide bar 145 fixed in parallel with the measurement bar 143 between the first vertical portion 141b and the second vertical portion 141c. Although the compression coil spring is illustrated as the elastic member 144 in this embodiment, various materials may be used as long as it can elastically press the measuring bar 143. One end of the elastic member 144 is supported by the second vertical portion 141c and the other end is supported by the stopper 146.

The stopper 146 is for limiting the movement of the measurement bar 143 to the front, the coupling portion 146a and the coupling portion 146a fixed by the screw 147 to the measurement bar 143. And a support part 146b formed to extend from one side to support the other end of the elastic member 144. The screw 147 for fixing the stopper 146 to the measuring bar 143 extends through the measuring bar 143 to the lower part of the measuring bar 143, and an extended portion of the screw 147. Is inserted into the guide groove 141d. That is, the screw 147 guides the measurement bar 143 to be reciprocated in the front and rear direction along the guide groove 141d of the horizontal portion 141a. In this embodiment, the screw 147 is inserted into the guide groove 141d to guide the measuring bar 143, but a separate guide protrusion 147 may be installed in the measuring bar 143. That is, in this embodiment, the screw 147 is used as the guide protrusion 147. In this way, the measurement bar 143 is guided by the first vertical portion 141b and the second vertical portion 141c and guided by the guide groove 141d of the horizontal portion 141a, so that the measurement bar ( 143) can be guided.

The displacement sensor unit 150 is for detecting the amount of movement of the measurement bar 143, the linear encoder strip 151 fixed to the measurement bar 143, and the scale of the linear encoder strip 151 It includes an encoder head 152 for reading the conversion to an electrical signal corresponding to the straight line distance. Since the linear encoder strip 151 and the encoder head 152 are already known techniques, a detailed description of the operation principle will be omitted. The encoder head 152 is installed to be fixed to the support 141.

The measuring controller 160 converts the electrical signal output from the encoder head 152 into a digital value and transmits the electrical signal to the measuring instrument wireless communication module 180.

The measuring instrument wireless communication module 180 converts the digital value transmitted from the measuring instrument controller 160 to correspond to a wireless communication standard and transmits the converted digital value to the terminal 200. As a wireless communication method, various methods such as a Bluetooth method may be used.

The meter wireless communication module 180 and the meter controller 160 are mounted in the form of a chip on a circuit board 170 fixed to the first vertical portion 141b and the second vertical portion 141c.

The terminal 200 includes a terminal wireless communication module 220, a terminal controller 240, a memory 260, and a display unit 280.

The terminal wireless communication module 220 receives a digital value transmitted from the measuring device wireless communication module 180 and outputs the digital value to the terminal control unit 240 or the display unit 280.

The terminal controller 240 receives and converts a digital value transmitted from the terminal wireless communication module 220 and outputs the digital value to the display unit 280 or stores it in the memory 260. In particular, the terminal controller 240 outputs a cylinder number to the display unit 280 to allow the operator to select a cylinder corresponding to the crank throw 11 of the measurement target through an input unit, not shown, and is measured by the operator. When the cylinder number of is selected, the interval variation of the crank throw 11 transmitted from the terminal wireless communication module 220 corresponding to the selected cylinder is stored in the memory 260.

The memory 260 stores a plurality of measurement points for each cylinder, and the terminal controller 240 transmits data on the amount of variation in the crank throw 11 interval, that is, the measurement points of each cylinder in the order of measurement. Store in In addition, the terminal controller 240 classifies the stored data for each cylinder and each measurement point and outputs the data to the display unit 280.

The measured data are classified for each cylinder and output to the storage and display unit 280, and are divided for each measurement point of each cylinder and output to the storage and display unit 280 to easily determine and manage the measured data. Becomes easy.

Hereinafter, the operation of the crankshaft deflection measurement method and the crankshaft deflection measurement system having the above-described configuration will be described.

First, the worker fixes the measuring device 100 to the crank throw 11. More specifically, grooves for fixing the measuring device 100 are formed on both sides of the crank throw 11, and the sharp part 143a of the measuring device 100 and the contact part 142a of the coupling member 142. Is inserted into the groove so that the measuring device 100 is fixed to the crank throw 11. When the installation of the measuring device 100 is completed, after adjusting the zero point, the cylinder number corresponding to the crank throw 11 to be measured is selected, and the crank shaft is positioned while rotating the crank shaft 10 using a generator or the like. The spacing of the crank throw 11 is measured for a plurality of points.

Here, the measurement point and the measurement time for each of the plurality of points may be determined by the user manually inputting the terminal 200, but may be automatically measured for each unit time based on the rotational speed of the crankshaft 10.

When the crankshaft 10 rotates and the amount of change in the interval of the crank throw 11 occurs, as shown in FIGS. 6A and 6B, the measurement bar 143 moves in the front-rear direction. At this time, the encoder head 152 detects the scale of the linear encoder strip 151 moving together with the measuring bar 143 and transmits the scale to the measuring controller control unit 160. Then, the meter control unit 160 converts the transmitted electrical signal into a digital value and transmits it to the meter wireless communication module 180. Then, the measuring device wireless communication module 180 is converted to a value corresponding to the communication method and transmitted to the terminal wireless communication module 220. Then, the terminal wireless communication module 220 transmits data to the terminal controller 240, and the terminal controller 240 outputs the data to the display unit 280 and stores the data in the memory 260.

In this case, the measured value is stored in the location of the memory 260 corresponding to the selected cylinder, and is stored in the memory 260 corresponding to the plurality of measuring points of the selected cylinder in the order of measurement. In addition, the terminal controller 240 displays the deflection value of the crankshaft, that is, the amount of variation in the crank throw interval, on the display unit 280 for each cylinder and each measurement point of each cylinder.

By repeating the above-described measurement process, it is possible to measure the amount of change in the interval of each crank throw 11 corresponding to the plurality of cylinders.

According to the present invention as described above, by forming the case made of a plastic material, not only the weight of the measuring instrument can be reduced, but also the reception sensitivity of the measurement data can be improved.

In addition, the coupling rib is formed on the edge of the upper case, the coupling slot is formed in the edge of the lower case is formed, it is possible to prevent foreign substances such as engine oil flow into the case. In particular, a partition wall and a partition wall slot through which the partition wall is inserted are formed between the first accommodation part and the second accommodation part so that foreign matters such as engine oil flow into the measurement module introduced through the second accommodation part. Can be prevented.

On the other hand, since the measurement bar is guided by the first vertical portion and the second vertical portion to move forward and backward, the guide member and the support plate on which the existing guide rail and the guide groove are formed can be omitted. By omitting these components, not only the number of parts can be reduced, but also the assembly process can be simplified and the size of the meter can be reduced. As the measuring device becomes smaller, it can be applied to measure the deflection of a small engine crankshaft as well as a large marine engine.

In addition, the measurement bar is guided by the first vertical portion and the second vertical portion and guided by the guide groove of the horizontal portion, thereby guiding the movement of the measurement bar more precisely.

In addition, by inserting a screw for fixing the stopper to the measuring bar in the guide groove to guide the measuring bar, the number of parts can be further reduced and the structure can be more advantageous for miniaturization.

On the other hand, the measured data is classified by cylinders and output to the storage and display unit, and the measured data of each cylinder are divided and output to the storage and display unit to easily determine the measured data as well as to facilitate data management. have.

Claims (16)

delete delete delete delete delete delete A plastic case having a first accommodating part and a second accommodating part formed to be partitioned from the first accommodating part and accommodating a battery; A measurement module mounted to the first accommodating part and configured to measure an interval variation of the crank throw and output an electrical signal; And A meter wireless communication module provided inside the case to be electrically connected to the measurement module and transmitting measured data in a wireless communication method, The case includes an upper case and a lower case coupled to the upper case, The upper case and the lower case are coupled by a coupling rib into which the coupling rib and the coupling rib are inserted so as to prevent external foreign matter from entering therein, The coupling rib is formed on the edge of the upper case, the coupling slot is formed on the edge of the lower case, Between the first accommodating portion and the second accommodating portion, a partition wall and a partition wall slot into which the partition wall is inserted are formed. The partition wall is formed in the upper case, The partition wall slot is formed in the lower case, The measurement module, A support having a horizontal portion and a first vertical portion and a second vertical portion spaced apart from the horizontal portion, the second vertical portion having a contact portion in contact with one surface of the crank throw; A measuring bar protruded from the first vertical portion so that the first vertical portion and the second vertical portion are reciprocated in the front-rear direction and protrude from the first vertical portion such that one end is in contact with the other surface facing one surface of the crank throw; A displacement sensor unit for detecting an amount of forward and backward movement of the measurement bar; An elastic member for urging the measurement bar forward; And A stopper for limiting the measurement bar from moving forward, The stopper is, A coupling part fixed to the measurement bar; And A support part installed to protrude from the coupling part to one side and supporting one end of the elastic member, The other end of the elastic member is supported by the second vertical portion crankshaft deflection measuring device. The method of claim 7, wherein Guide grooves are formed in the horizontal direction in the horizontal portion, And a guide protrusion inserted into the guide groove so that the measuring bar is inserted into the guide groove and guides the movement of the measurement bar in the front-rear direction. The method of claim 8, And the guide protrusion is a screw for coupling the coupling part to the measurement bar. The method of claim 9, wherein the displacement sensor unit, A linear encoder strip fixed to the measuring bar and moving in the front and rear direction together with the measuring bar; And And an encoder head which outputs, as an electrical signal, an amount of change in the distance between one surface and the other surface of the crank throw from the forward and backward movement of the linear encoder strip. delete delete delete delete delete delete

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